Amphibian Metamorphosis
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<speciesfyi-glossary slug="amphibian-metamorphosis"></speciesfyi-glossary>Definition
The transformation of aquatic larvae such as tadpoles into terrestrial adults, involving the development of lungs and limbs.
Detailed Explanation
Amphibian metamorphosis is driven by thyroid hormones, which trigger resorption of the tail, development of limbs, restructuring of mouthparts, and transition from gill to lung respiration. The process requires substantial energy reserves accumulated during the larval feeding stage. Endocrine disrupting chemicals — including atrazine and other agricultural chemicals — interfere with thyroid hormone signaling, causing intersex individuals and incomplete metamorphosis in wild populations.